<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
    <style>
        .box{
            width: 200px;
            height: 200px;
            background-color: aqua;
        }
    </style>
</head>
<body>
    <div id="root">
        <button @click="handel">点击</button>
        <div class='box'  v-show="show"></div>
    </div>
</body>
</html>
<script>
    const vm = new Vue({
        el:'#root',
        data:{
            show:true
        },
        methods:{
            handel(){
               this.show = !this.show
            }
        }
    })
</script>